Low porosity solid electrolyte membrane and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-2018342768-A1
Application number	US-201715843631-A
Country	US
Kind code	A1
Filing date	Dec 15, 2017
Priority date	Dec 16, 2016
Publication date	Nov 29, 2018
Grant date	—

Abstract

An improved, low porosity, solid electrolyte membrane and a method of manufacturing the solid electrolyte membrane are provided. The low porosity, solid electrolyte membrane significantly improves both mechanical strength and porosity of the membrane, inhibits the growth of lithium dendrites (Li dendrites), and thereby maintains and maximizes electrochemical stability of an all-solid-state battery. This is accomplished by wet-coating a sulfide or oxide solid electrolyte particle with a thermoplastic resin, or a mixture of the thermoplastic resin and a thermosetting resin, using a solvent to prepare a composite and hot-pressing the composite at a relatively low temperature and at a low pressure.

First claim

What is claimed is:

1 . A low porosity solid electrolyte membrane comprising a solid electrolyte particle coated with a polymer film, wherein the polymer film comprises at least one thermoplastic resin.

2 . The low porosity solid electrolyte membrane of claim 1 , wherein the polymer film further comprises at least one thermosetting resin.

3 . The low porosity solid electrolyte membrane of claim 1 , wherein the solid electrolyte membrane is hot-pressed.

4 . The low porosity solid electrolyte membrane of claim 1 , wherein the solid electrolyte particle is a sulfide or an oxide solid electrolyte particle.

5 . The low porosity solid electrolyte membrane of claim 1 , wherein the thermoplastic resin is selected from the group consisting of polymethyl methacrylate, polystyrene and polyester resins.

6 . The low porosity solid electrolyte membrane of claim 2 wherein the thermosetting resin is selected from the group consisting of an acrylonitrile-butadiene rubber, an epoxy resin and an unsaturated ester resin.

7 . The low porosity solid electrolyte membrane of claim 1 , wherein the low porosity solid electrolyte membrane comprises:
from about 70 to about 98% by weight of the solid electrolyte particle; and from about 2 to about 30% by weight of the thermoplastic resin.

8 . The solid electrolyte membrane of claim 2 , wherein the low porosity solid electrolyte membrane comprises:
from about 65 to about 97% by weight of the solid electrolyte particle; from about 2 to about 30% by weight of the thermoplastic resin; and from about 1 to about 5% by weight of the thermosetting resin.

9 . The low porosity solid electrolyte membrane of claim 3 , wherein the hot-pressing is carried out at a temperature greater than or equal to the glass transition temperature of the thermoplastic resin and at a pressure of from about 200 to about 500 Mpa.

10 . The low porosity solid electrolyte membrane of claim 9 , wherein the hot-pressing is carried out at a temperature of from about 100 to about 240° C.

11 . The low porosity solid electrolyte membrane of claim 9 , wherein the hot-pressing is carried out at a temperature less than or equal to the melting point of the thermoplastic resin.

12 . A method of manufacturing a low porosity solid electrolyte membrane comprising:
(a) mixing a solid electrolyte particle with at least one thermoplastic resin and a solvent to form a solid electrolyte mixture; (b) removing the solvent from the solid electrolyte mixture by drying to prepare a solid electrolyte composite; and (c) hot-pressing the solid electrolyte composite.

13 . The method of claim 12 , wherein the solvent is capable of dissolving the resin and wet-coating the resulting mixture.

14 . The method of claim 12 , wherein the solid electrolyte particle is a sulfide or an oxide solid electrolyte particle.

15 . The method of claim 12 , wherein the thermoplastic resin is selected from the group consisting of polymethyl methacrylate, polystyrene and polyester resins

16 . The method of manufacturing a low porosity solid electrolyte membrane of claim 12 , wherein at least one thermosetting resin is mixed into the solid electrolyte mixture prior to the step of removing the solvent.

17 . The method of claim 16 , wherein the thermosetting resin is selected from the group consisting of an acrylonitrile-butadiene rubber, an epoxy resin and an unsaturated ester resin.

18 . The method of claim 12 , wherein the solid electrolyte mixture comprises from about 5 to about 50 weight percent solvent.

19 . The method of claim 16 , wherein the solid electrolyte mixture comprises from about 5 to about 50 weight percent solvent.

20 . The method of claim 12 , wherein the hot-pressing is carried out at a temperature of from about 100 to about 240° C. and at a pressure of from about 200 to about 500 Mpa.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp
• Ulsan National Institute Of Science And Tech

Inventors

• Kwon Oh Min
• Min Hong Seok
• Yoon Yong Sub
• Kim Kyung Su
• Oh Dae Yang
• Jung Yoon Seok
• Nam Young Jin
• Jung Sung Hoo

Classifications

• H01M10/486

  for measuring temperature · CPC title

• H01M10/484

  for measuring electrolyte level, electrolyte density or electrolyte conductivity · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M2300/0082

  Organic polymers · CPC title

• H01M10/058

  Construction or manufacture · CPC title